I've been wanting to use Atlantis for quite some time and knew that I needed to layer it over the top of something because I've swatched it on wheels in the past.
So Sally Hansen HD Pixel Pretty is one of my untrieds - it was a gift from a friend. It has a really pretty shimmer but I didn't really notice much duochromey-ness? This is 2 coats. It dries slow - I had some slight problems with bubbling - but it flows and covers well.